From: Marcin Kalicinski (kalita_at_[hidden])
Date: 2006-04-19 13:07:42
> Two things that I had to roll into my config system:
> a) ability to include other files
This is a parser job to handle includes. Of the parsers included with the
library only INFO supports them, but I believe other formats (XML, JSON,
INI) do not have a notion of include at all.
> b) inline variable expansion, e.g.
> site.root = c:\dev
> site.home = ${site.root}\home
Yeah, long time ago the library supported that. There are actually 2 types
of "dynamic values", or inline-expanded values as you call them:
1. Values which are expanded statically during parsing
2. Values which are fully dynamic - i.e. lookup is performed everytime you
access the value (so if you change the original, the dependent changes as
well).
#1 is just a parser issue - something along the lines of statically expanded
entity references in XML. #2 requires support infrastructure from the
basic_ptree class - namely a pointer to parent. And a way to describe
relative paths, so more extra characters would be needed than just the
separator.
> What are your thoughts on this being included in your library?
> Anyone else need to do this type of stuff, or would find this useful?
If there is enough interest I may try to revive it. On the other hand, a
better solution might be to build another class on top of ptree that
supports dynamic values.
Marcin